Fault diagnosis of the hottest printing machinery

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Fault diagnosis of printing machinery and equipment

as we all know, due to the complex structure, high degree of automation and diversified functions of the newspaper printing machine F. display mode: utm107+win-xp test software computer screen display, making the equipment fault more and more complex. Especially with the increasing popularity of shaftless printing presses, fault diagnosis and troubleshooting are becoming more and more difficult. On the other hand, the current printer maintenance personnel mainly rely on personal maintenance experience to troubleshoot the printer. However, due to the full involvement of numerical control technology, the mobility of maintenance personnel and the differences of technology, different maintenance personnel have great differences in the judgment and troubleshooting of the same kind of faults. At the same time, there is a dual division of labor between the mechanical part and the electrical part in the maintenance division of the printing press, and the reasons for the failure are also different from human and natural wear and tear. Therefore, based on the accumulation of previous maintenance experience, combined with the actual situation of newspaper printing, the case method is introduced into the maintenance of printing machine, which can overcome many difficulties, quickly find the cause of failure, and restore normal printing

case method

case method (also known as case-based reasoning method) is a new knowledge-based problem solving and learning method in the field of artificial intelligence. It shows strong vitality to people with its unique reasoning style and successful application. This method is very close to human's daily reasoning activities. It comes from people's cognitive and psychological activities, which is different from the traditional knowledge-based system. The knowledge it relies on is mainly the specific records of previously solving problems in related fields stored in the maintenance system, such as cases in hospitals, maintenance records of metallurgical equipment, etc

when a new fault occurs, we can describe it as a new case without knowing the cause and solution to the system, and the system will search the case database for historical cases similar to the current problem as much as possible to match it. In many cases, the system will provide several similar solutions. In practical application, case-based reasoning can be divided into four steps

1. search: search the case most similar to the new problem from the case base

2. Application: apply the methods provided by the system to new problems. If there is enough similarity between the case and the new problem, the new problem is expected to be solved

3. correction: when the method provided by the system cannot solve the problem, the method must be corrected

4. save: add the modified case to the case base

in short, case method is to describe the problems handled in the past as cases composed of problem expression and solutions, store them in the case base, and retrieve similar old cases from the case base when new problems come. If the new problem is completely consistent with the old case, the solution of the old case can be used to solve the new problem. Otherwise, it is necessary to modify the old case to get a solution to the new problem. Generally, the solution of new cases should be saved in the case base to enrich the case base and realize the automatic update of the case base. Generally speaking, the fault reasoning of case method is an important part of equipment fault diagnosis. There are two ways to realize it: semi-automatic realization and intelligent realization

specifically, the realization of semi automation is mainly based on computer and database technology, constantly enriching records by hand, and intuitively showing past experience for future maintenance reference. The realization of intellectualization mainly relies on the sensing technology to automatically collect the fault signal on site, and directly display the cause and possible cause of the fault through the database and the corresponding system. The only difference between semi-automatic realization and intelligent realization lies in whether the data entry is manual collection or automatic input. In fact, the semi-automatic implementation method is the primary stage of case law, and it is the most commonly used method to ensure that customers here can also obtain the best products in the market. This paper mainly discusses this kind of case law. The key to the establishment and operation of case law and application case system lies in the completion of case base and the accuracy of data. Therefore, to establish and apply case system, we must first carry out the construction of case base. The initial case comes from the experience of previous maintenance work. According to the description of previous fault handling by maintenance personnel, the fault case is established according to the representation of the case, described by the characteristic index value of each fault case, and the case base is established by using relational database technology

we sort out and classify the past experience, systematically summarize and organize it, and finally express the experience in the form of cases and store it in the case base. Most cases can be stored in the case base during development. With the continuous accumulation of experience, the continuous addition of cases and the continuous improvement of the case base, there are many cases that need to be revised, so as to continuously improve the case base

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